John 3:16-17 For God so loved the world, that he gave his only begotten Son, that whosoever believes on him shall not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

It's simple as A - B - C!

Admit

Romans 3:23 For all have sinned and come short of God's glory.

Romans 5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men. 

Romans 6:223 For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord. 

Believe

John 3:16-17 (see above) that God sent his Son to die for your sins and the sins of the whole world

Romans 5: 6 For when we were yet without strength, in due time Christ died for the ungodly.

Confess

Romans 10:9 That if you confess with your mouth the Lord Jesus, and shall believe in you heart that God hath raised him from the dead, you will be saved. 10 For with the heart man believes unto righteousness; and with the mouth confession is made unto salvation 11 For the scripture days, Whosoever believes on him shall not be ashamed.